Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: Jed on August 05, 2009, 01:43:59 PM

Title: pros and cons of moters and servos
Post by: Jed on August 05, 2009, 01:43:59 PM

what are the differences of moters and servos i am using the Axon

Title: Re: pros and cons of moters and servos
Post by: SmAsH on August 05, 2009, 03:07:10 PM

motors will require a h-bridge to drive them as connecting them to the axon directly will fry the pin.
servos are a dc motor, a gearbox and a h-bridge all in one nice, neat package... but they need to be modified to rotate continuously... there are hundreds of topics in the forum about this, search it.

Title: Re: pros and cons of moters and servos
Post by: Soeren on August 05, 2009, 06:08:42 PM

Hi,

Quote from: SmAsH on August 05, 2009, 03:07:10 PM

motors will require a h-bridge

Nope, they'll require some kind of driver, of which an H-bridge is just one example.
(Capital "H" in H-bridge please, that's the figure that gave the circuit its name - an h-bridge must be an H-bridge where the rightmost top transistor has gone permanently O.C. - which, by incident, is pretty rare, considering that the typical failure mode for a transistor is shorted).

Title: Re: pros and cons of moters and servos
Post by: paulstreats on August 05, 2009, 06:24:07 PM

Quote

an h-bridge must be an H-bridge where the rightmost top transistor has gone permanently O.C. - which, by incident, is pretty rare, considering that the typical failure mode for a transistor is shorted

he he..

To answer the original question...

A motor is a motor.

A Servo is a device that contains a motor along with a closed loop system, driver circuitry, gearing, and 1 wire communications.

To put it short:
A servo is an all in 1 package that has restricted movement unless you are willing to modify it.

A motor is 1 single part of a drive system.